Elevating device



March 12, 1929, P. w. SAITTA ELEVATING DEVICE Filed April 6, 192'? 3 Sheets-Sheet 1 I INVENTOR ATTORN EY March 12, 1929. P. w. SAITTA ELEVATING DEVICE Filed April 6. 1927 5 sheets-Shea: 2

INVENTOR ATTORNEY March 12, 1929. w, sAlTTA 1,705,420

I ELEVATING DEVICE Filed April e, 1927 s Sheqts-She'bt '3 III I I, I, I

ATTORN EY EiEEIIIIIII/IIIII III II Patented Mar. 12, 192%).

PHILIP W. SAITTA, OF LEBANG'N, PENNSYLVANIA, ASSIQNGR TO CRESCENT TR'ETCK COMPANY, OF LEBANON, PEHBTFAYLVANIA, A CORPORATION OF PENNSYLVANIA.

ELEVATING DEVICE.

Application filed April 6,

This invention relates to an electric industrial truck of the elevating platforni type, the general object the invention being to provide means for elevating the platform by means of a foot pedal which is operated by the truck driver from the operating platform of the truck.

Ano her object of theinvention is to proride locking means for holding the platform elevated, with hand operated means for releasing the locking means. to permit the platformto return toits normal lowered position.

A still further object of the invention is to provide ratchet means for communicating the movement of the foot pedal to the raising means of the platform.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing my invention in detail, ref erence will be had to the accompanying drawings wherein like characters denote l1ke or corresponding parts throughout the several views, and in which Figure 1 is a view show ng the truck in dotted lines, the elevating means in full lines and the platform in section.

Figure 2 is a similar view but showing the parts with the platform in ra sed posit on.

Figure 3 is a rear view with parts in section.

Figure 4 is a section on line 4-4 of Figure 3.

In these views, 1 indicates the platform of the truck which is connected with a portion of the base of the truck by the links 2 so that the platform can be raised and lowered. A shaft 3 is journaled in the uprlghts 1 and a pair of toothed sectors 5 and 6 1s keyed to the shaft. A pair of arms 7 is also keyed or otherwise fastened to the shaft and a link 8 1s pivoted between these arms and has a bracketpivoted to its lower end, which bracket 1s connected with the inner end of the platform 1.

A foot pedal 10 has its forked end rot-atably mounted on the shaft 3, the prongs straddling the sector 5 and a spring pressed pawl 11 18 carried by said pedal and engages the teeth of the member 5, these parts being so arranged that when the pedal is depressed, the pawl, engaging a tooth of the sector, will 1927. Serial No. 151,502.

cause the sector to move with the pedaland thus the shaft will be rocked.

A pawl 12 is pivotally arranged on a shaft 13 which is carried by a pair of uprightsto prevent retrograde movement of the sectors and the shaft 3, as these parts are moved by the depression of the pedal.

The curved releasing lever 1% is pivoted on the shaft 13 and the pawl 12 has aprojection 15 which extends over the top ofthe lever .14

so that when said lever is raised, it will enconnected by a link 22 with a bell crank 23,

the upper part of which is formed wit-h a handle 24 so that the elevation of the handle 24 will cause the connecting parts to raise the lever 14 to lift the pawls.

Both the pedal and the handle 24 are so located that they can be conveniently reached by an operator standing on the operators platform of the truck, and as will be seen, when the operator wishes to raise the plat form 1, it is simply necessary to depress the foot pedal by his foot, which will rock the shaft 3 through means of the ratchet mechanism described, and this rocking movement will lift the link 8 and thereby raise the plat form 1. WVhen the foot is raised, a spring 25, which connects the pedal with the bracket 21, willreturn the pedal to raised position again, and in this action, the pawl 11 ratchets over the member 5, which member, together with the member 6 and the shaft, is prevented from moving with the pedal through means of the pawl 12 engaging the ratchet member- 6. Then the pedal can be depressed again to raise the platform 1 another step and so on until the platform has been raised as far as desired. When the platform is to be lowered itis simply necessary to depress the handle 24: to cause the lever 14 to release the pawl 12 which will permit free movement of the shaft 3 and thus the weight of the platform will return the parts to their normal position with the platform in its lowest position.

Thus with this improvement, the truck can be moved to a point to position its platform under a skid A and then the platform can be raised by means of the foot pedal to elevate the skid. Then the skid, with the load thereon, can be transported to any point desired, and by lowering the platform through means of the handle 24, the skid can be deposited at its destination and the truck moved to an-. other point to receive a new load. With this invention, the truck can be loaded and unloaded without the operator leaving his platform.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is In combination with atruck having a vertically movable platform, a rock shaft journalled in a part of the truck, an arm on the shaft, a link connecting the arm with the part on the platform whereby movement of the shaft will act to move the platform, a pair of toothed sectors on the shaft, a foot pedal having a forked end the prongs of Which rotatably engage the shaft, one on each side of one of the sectors, a spring pressed pawl carried by the pedal and engaging said sector, whereby oscillation of the pedal will rotate the shaft, a locking pawl engaging the second sector for preventing retrograde movement of the shaft, a releasing lever pivoted to the shaft, a projection on each pawl engaged by the lever whereby the pawls will be moved to releasing position when the lever is raised, a hand lever and means for connecting the hand lever to the releasinglever.

In testimony whereof I afiix my signature.

' PHILIP W. SAITTA. 

